Caldwell Drum Lifter Locking Type Clamp

Drum Lifter Locking Type Clamp — Model 300-S for Secure Vertical Lifting of Metal Drums

The Caldwell RENFROE Model 300-S Drum Lifter is a locking-type clamp engineered for the vertical lifting and transporting of metal drums in industrial and construction environments. Designed for contractors and trades professionals who require reliable, repeatable drum handling, the 300-S delivers a 3,000 lb. rated capacity while handling one drum per lift. It is available in three part configurations to accommodate different drum diameters, making it a versatile addition to any rigging operation.

What sets the Model 300-S apart is its past center locking device, which mechanically secures the clamp tightly to the drum before and during the lift — eliminating reliance on friction or operator tension alone. This positive-lock design provides a meaningful safety advantage over non-locking drum handling alternatives.

Key Features & Benefits

Past Center Locking Device

The 300-S is equipped with a past center locking mechanism that secures the clamp firmly to the drum rim during operation. This positive-lock engagement means the clamp cannot inadvertently release under load, giving operators and site supervisors greater confidence during vertical lifts.

3,000 lb. Rated Capacity

With a rated capacity of 3,000 lbs., the Model 300-S is built to handle heavy industrial metal drums that are common on commercial and industrial job sites. The factory notes that larger capacities may be available upon consultation, providing flexibility for demanding applications.

Single-Drum Vertical Lift Orientation

The 300-S is purpose-built for vertical lifting of one drum at a time, keeping each lift controlled and predictable. This dedicated single-drum design supports balanced, in-line lifting when the rigging force is directly above the lifting shackle.

Multiple Drum Diameter Configurations

Three part numbers — 300S-01.50-A (22.5 in. dia.), 300S-01.50-B (16.5 in. dia.), and 300S-01.50-C (18.5 in. dia.) — allow contractors to select the correct fit for their specific drum size. This ensures a secure clamp engagement rather than relying on an oversized clamp to grip a smaller drum.

Compact, Lightweight Construction

Weighing between 23 and 25 lbs. depending on configuration, the Model 300-S is manageable for individual operators to handle and position without additional equipment. The 25 in. overall clamp height keeps the assembly compact relative to its 3,000 lb. capacity rating.

Manufactured by The Caldwell Group (RENFROE Brand)

The RENFROE brand has been trusted by international lifting clamp users for more than 50 years and is manufactured by The Caldwell Group, Inc. in Rockford, IL. This pedigree matters to contractors sourcing equipment where long-term parts availability, repair kits, and factory support are operational requirements.

Common Applications

Vertical Drum Lifting on Construction Sites

The 300-S is used to vertically lift metal drums for loading, unloading, or repositioning on job sites where crane or hoist rigging is available.

Industrial Drum Transport

Once clamped and locked, the 300-S allows a single metal drum to be safely transported via overhead lifting equipment without the drum shifting or releasing mid-move.

Warehouse and Distribution Drum Handling

In warehouse environments, the locking clamp allows operators to move heavy metal drums from storage racks or floors to transport vehicles with consistent, repeatable security.

Compatible Materials

• Metal drums

Product Documents

• Download Catalog
• Download Manual
• Lifting Clamp Survey Report
• Lifting Tool Inventory and Maintenance Form
• Minimum Recommended Clamp Inspections
• Renfroe Repair Kits Catalog

Application Instructions

Before the Lift

1. Read and understand the operator manual before using the clamp.
2. Inspect the clamp before each lift and follow all inspection and maintenance instructions.
3. Secure the load before attaching the clamp.
4. Select the correct part number for your drum diameter (300S-01.50-A for 22.5 in., 300S-01.50-B for 16.5 in., 300S-01.50-C for 18.5 in.).
5. Use the correct clamp for the job; do not use large-capacity clamps to lift light loads.
6. Use a flexible connection between the crane hook and the clamp shackle — do not attach the clamp directly to the crane hook, and do not use a heavy flexible connection.

During the Lift

1. Lock the clamp closed with the lock before lifting; do not lift with the lock in the open position.
2. Ensure the lifting force is directly above and in line with the lifting shackle (vertical lift orientation).
3. Do not lift over workers, safety areas, or personnel.
4. Do not rush; lift only one drum at a time with this vertical clamp.
5. Do not use a connection that may release the clamp during the lift.
6. Use clamps within their rated capacity; do not overload.

Maintenance

1. Inspect the clamp before each lift per the operator manual instructions.
2. Use only RENFROE replacement parts to ensure proper operation of the clamp.
3. Do not alter the clamp; do not grind, weld, or modify it in any manner.
4. Consult the operator manual or factory when in doubt about condition or application.

Technical Specifications

Frequently Asked Questions

Q: How many drums can the Model 300-S lift at one time?
A: The Model 300-S is capable of handling one drum at a time. For multi-drum lifts, a different model such as the Model 400-M (four-drum capacity) would be required.

Q: What drum diameters does the Model 300-S accommodate?
A: Three configurations are available: 300S-01.50-A for 22.5 in. diameter drums, 300S-01.50-B for 16.5 in. diameter drums, and 300S-01.50-C for 18.5 in. diameter drums.

Q: Can the Model 300-S be used for horizontal lifting?
A: No. The Model 300-S is designed for vertical lifting only. Using a vertical-lift-only clamp to lift a load horizontally is explicitly listed as a prohibited use in the operator manual.

Q: Is a larger capacity version of the Model 300-S available?
A: The standard rated capacity is 3,000 lbs. The manufacturer notes that larger capacities may be available — consult the factory directly for those requirements.

Q: What type of drums is the 300-S compatible with?
A: The Model 300-S is designed for use with metal drums only.

Q: Where can I get replacement parts for the Model 300-S?
A: Only RENFROE replacement parts should be used to ensure proper operation of the clamp. The Renfroe Repair Kits Catalog is available as a downloadable document above. Do not alter, grind, weld, or modify the clamp in any manner.